Tungsten carbide tool grinder



TUNGSTEN CARBIDE TOOL GRINDER Filed Jan. 14, 1946 WIN IN VEN TOR.

A TTOKNEY.

Patented Dec. 28, 1948 OFFICE TUNGSTEN CARBIDE TOOL GRINDER Frank P.Slater, Kansas City, Mo. Application J anuary 14, 1946, Serial No.641,121

3 Claims.

This invention relates to grinding equipment in general, andparticularly to grinders for tungsten carbide tools that are preferablysharpened or contoured through the employment of a grindingpelementhaving among other material, diamond chips or dust, and because of whichit is desirable to provide a coolant during the grinding operation.

The provision of such a coolant or a liquid serving as such, is atroublesome problem and grinders have heretofore, been renderedexpensive and complicatedbecause of efforts to include therein, meansfor pumping or otherwise forcing a liquid to the zone of juncturebetween abrading element and tool being ground. It is one-of the primaryobjects of this invention, therefore, to provide a grinder with meansfor automatically directing a jet of liquid, capable of cooling thefrictionally engaged surfaces throughout the entire time that grindingof the tool takes place.

A further important object of this invention is to provide a grinderwith an adjustable head, capable of maintaining the tool at an anglewhere the operator may manipulate the same with the desired amount ofpressure toward the abrading surface of a specially mounted cup, havingas a part thereof, the means for forcing liquid from the lower part ofthe reservoir to a place where it will come into contact with the tool.

Other objects of the invention are important and will appear during thecourse of the following specification, referring to the accompanyingdrawing, wherein:

Fig. 1 is a top plan view of a grinder for tungsten carbide tools, madein accordance with the present invention; and

Fig. 2 is a vertical central sectional view thereof.

The form of the invention chosen for illustration, comprises a reservoirIll suitably mounted upon such supports l2 as may be adequate to holdthe entire assembly in operative position, and a prime mover in the formof a motor l4, the shaft l 6 whereof normally extends vertically.

This shaft is passes through a packing I8, capable of precluding seepageor leakage of liquid 20 from within reservoir l0, and the upper end ofshaft I6 carries a cup 22, cast or otherwise formed of a strongsubstance having a facing of abrading material at its edge and againstwhich the later described tool is drawn during operation of the grinder.

Cup 22 has its annular side wall 24 flared or projected upwardly andoutwardly from the base 26 of cup 22, and it is the upper, annular edgeof this wall 24 that is brought against the tool. A duct 28 disposed atan angle with respect to the-axis of rotation of shaft 1 6 and cup 22,has its'lower end in the lead withrespect to the direc- ';1.;l3101'l of*rotationof the cup-thus, as the cup is l rotated, liquid will be drivenupwardly through duct 28 and be -directed toward the inner face i ofwall 24 adjacent to the annular edge 30 thereof; The supplying'of liquidto the frictionally m interengaged surfaces of cup'22 and the tool 32,that is .being ground, is accomplished by this simple groupof partsandiso long as the level of liquid20. remains above the lower end of duct28, an adequate supply of liquid will be forced 15:: against theperiphery of cup 22.

The head for holding tool 32 is capable of movement/aboutalvertical axisas well as a substantially horizontal axis, or one that is disposed atright angles to the axis of standard 34.

This standard 34 projects upwardly through an opening in the bottom ofreservoir l0, and for simplicity of structure, is a continuation of oneof the anchoring bolts 36 that serve to hold motor M in place. The bodyof this head is in two sections-one designated by the numeral 38 isrotatably mounted on standard 34 and held in a selected position alongthe length of said standard by set-screw 40. The other section 42 ofthis body, is held in position by setscrew 44, and therefore, the tool32 may be held to have the end thereof ground at an angle suitable tothe desires of the operator. This setscrew 44 passes through the section38 above set-screw 40 and is in screw threaded engagement with section42 for holding the latter part against section 38. Obviously, theseset-screws and 44 may be manipulated after tool 32 is introduced intosection 42, and if it is necessary or desirable to maintain tool 32 inplace through to manual force rather than mechanical, these twoset-screws may be left in a loosened condition and such pressure asneeded then applied by the hand of the person manipulating the grinder.Cup 22 is removably mounted upon shaft I6 45 and as wear occurs andrenewal becomes necessary, such may be accomplished with ease anddispatch.

It will be obvious to one skilled in the art that the head comprisingthe tool holder, may be set at any desired angle to support tool 32where it will respond to the touch or grip of the operator as he appliesthe desired amount of pressure for the grinding action.

The coolant will be automatically supplied to the inter-engaging facesof tool 32 and cup 22,

and all driven substances will be confined within reservoir l and willnot, therefore, create dirt or muss of an objectionable nature.

Reservoir I0 should have its annular, continuous side wall angledinwardly as the top is appreached to insure a fulfillment of one of theobjects of the invention with respect to cleanliness during the grindingaction.

Having thus described the invention, what is claimed as new and desiredto be by Let-- ters Patent is:

1. In a tool grinder of the character described, a reservoir for liquidcoolant; a grinding elementrotatably mounted in the reservoir-withapcrticn thereof below the level of the liquid; and means bottom and anupwardly directed, diverging side wal-lcircumscribing the element andtool holding for directing the liquid toward one suriace' of theelementas the element is rotated said means comprising a duct formed in thelenient with one end thereof below the surface of the liquid; the

said duct being inclined with respect to the axis oflkmtaticrr ei t e.element: and with thesaid one end-ofrthe duct leading vtheremainingxpcrtion thereof as the: elementis-rotated in one direction;

2.:In a too grin r either-character-described,-

a, reservoir for liquid coolant; agrinding-element rotatably mountedinthe reserVQ t withaporticn thereoftbelow-the-level;ointhe liq d} andmean-s: for directing the liquid toward one-surface off the elementas,the element'nis .r0tated,:=said means; comprising a duct formed intheelemeutwithoue end thereof belowthe; surfacemt thew-liquid, the

said duct being inclined with respect to! theaxis e ofrotation of theelement-and; Withwthe said-0ne end'rof the ductileadingthe-iremaining-uportion" thereof as the elementwisrotatedzinone-direction,

said grinding :elei'n'entfbeing cup-.shapedand shalt?- ing :its annularredge 1 projected upwardlysrsaid.

head, said structure comprising a duct formed in the element with oneend thereof below the surface of therliquid, the said duct beinginclined with respect to the axis of rotation of the elementandwith thesaid one end of the duct leading the remaining portion thereof as theelement isarotated in one direction P. shaman;

nsentences; crrnn;

The following references'are-fofirecordimi the file of this patent: 1

UNITED STATES" PATENTS i

